Microscopes and Accessory Apparatus Part 14

132. Length of cutting edge 36 cm =26.50=

133. " " " " 24 cm =13.25=

134. " " " " 16 cm =8.50=

135. " " " " 12 cm =5.50=

=B. Jung's Model=--plano-concave--requires knife-holder No. 139--in box.

[Ill.u.s.tration]

136. Length of cutting edge 24 cm =11.25=

137. " " " " 17 cm =6.--=

138. " " " " 12 cm =4.75=

139. =Knife-holder= designed for Jung's Microtome knife =4.--=

140. =Freezing apparatus= for Microtomes =8.--=

[Ill.u.s.tration: Freezing apparatus No. 140.]

=Hand Microtomes.=

[Ill.u.s.tration: No. 141.]

141. This =Hand Microtome=, shown in the figure above, screws to the edge of the table. The specimen is held in a clamp which may be removed from the instrument, and which is raised by a micrometer screw to which a large disc is attached, the edge of which is milled and graduated, each degree of the graduation representing an elevation of the specimen of 1/100 mm. The knife is manipulated by hand and in cutting slides over two narrow gla.s.s plates which serve as a track for it. The length of this track is 7 cm =12.--=

142. =Cylinder Microtome.= The specimen is held by means of a clamp-screw in a hollow cylinder. This entire cylinder is raised within another cylinder which bears the cutting table by means of a screw with milled and graduated head. Each division of the graduation represents a motion of the inner cylinder of 1/100 mm.

In cutting the edge of the knife is made to pa.s.s over the surface of the gla.s.s cutting table, the diameter of which is 7 cm =6.--=

[Ill.u.s.tration: Cylinder Microtome.]

143. =Microscopic section-cutter=--razor form--of best quality, plano-concave, for microtomes No. 141 and 142 =1.25=

=Miscellaneous Accessories.=

[Ill.u.s.tration:a.n.a.lizer. Polarizer.

Polarizing Apparatus No. 144.]

144. =Polarizing Apparatus= for Food a.n.a.lysis.

The a.n.a.lizer forms part of an ocular which fits into the tube of the microscope and is provided with a graduated disc and index. It is fixed in any desired position by means of a thumb-screw.

The polarizer, when used in connection with stands fitted with a substage condenser and iris-diaphragm, is hung in the carrier of the iris diaphragm; when used on other stands it takes the place of the cylinder diaphragm, and if desired may be furnished with a condenser. Price =22.--=

145. =Simpler Polarizing Apparatus.= The a.n.a.lizer is without an ocular and has no graduated disc. The polarizer is as described above =14.--=

146. =Gypsum= and =Mica plates= set of 8 =6.--=

147. =Covergla.s.s Tester=, for measuring the thickness of covergla.s.ses =3.75=

147a. =Covergla.s.s gauge=, dial form, for the rapid and accurate measuring of covergla.s.ses, thin plates etc. A slight pressure on a lever opens a pair of steel clips.

The exact thickness is at once indicated by a pointer moving over a divided circle on the lid of a metal box.

The gauge measures 0,01 up to 5 mm =12.--=

148. =Nose-piece= for two objectives--Double nose-piece =6.--=

149. =Nose-piece= for three objectives--Triple nose-piece =8.--=

150. =Nose-piece= for four objectives--Quadruple nose-piece =10.--=

Nose-pieces can be adjusted to our stands at any time without charge.

151. =Iris-diaphragm= =6.--=

[Ill.u.s.tration: Illuminating Lens No. 152.]

152. =Illuminating Lens on stand=, 100 mm diameter =12.--=

153. =Illuminating Lens on stand=, 60 mm diameter =8.--=

154. =Gla.s.s slides=, hollow, per doz =--.75=

155. =Gla.s.s slides=, English form 31", of plate-gla.s.s with polished edges, per gross =1.--=

156. =Gla.s.s slides=, with well, for moist chambers =--.40=

157. =Cover-gla.s.ses=, squares, 1515 mm, per 100 =--.60=

158. =Cover-gla.s.ses=, squares, 2020 mm, per 100 =--.85=

159. =Cover-gla.s.ses=, circles, 15 mm diameter, per 100 =--.85=

160. =Cover-gla.s.ses=, circles, 20 mm diameter, per 100 =1.--=

[Ill.u.s.tration: Turn-table No. 161.]

161. =Turn-table=, for ringing, with adjustable slide clips =4.--=

162. =Thickened Cedar Oil= for oil-immersion lenses, 1 oz =--.40=

163. =Object Marker.= This is designed to indicate the exact portion of an object which has been seen in the field of the microscope. After finding the required field, the objective of the microscope is unscrewed and the marker is screwed into the tube in its place. By then moving the tube so that the marker comes in contact with the object that portion of the object which occupied the optical axis of the microscope is indicated =1.25=