HARDWICKE'S SCIENCE-GOSSIP. 



113 



MICROSCOPY. 



A New Microscopical Lamp. — The micro- 

 scopical Lamp which I have designed, and of which 

 I send a rough sketch, has, I venture to think, some 

 distinctive advantages. (1) The form of base gives a 

 good support, and by allowing a foot of the micro- 

 scope to rest^between two of its feet, admits of the 



Fig. 64. — a, base, with four feet which have cork or caoutchouc 

 studs underneath, the base to be of somewhat larger diameter 

 than the oil container. This base can be fitted with a 

 sliding gear, as_ Figs. 66 and 67, giving the lamp a lateral 

 movement of i inch on each side of the centre of the base, 

 thus facilitating exact centering of light without moving the 

 base. B, pillar. To prevent rotation of lamp the pillar 

 could be made square, or have a narrow and shallow slot 

 cut in it, and a pin could be passed through the collar into 

 the slot, c, ring at top of pillar for carrying lamp. D, oil 

 container; diameter 6 inches, with filling hole (e). c, ro- 

 tating burner with }-inch wick : half a revolution, by means 

 of a_ revolving collar with stops, can be given to burner, to 

 admit of the use of the flat flame or of its edge. H, metal 

 chimney; dull black inside. K, box or wider part of chimney 

 surrounding flame, L, projection from box for holding glass 

 slips. M, glass slip in place. N, pinching collar with screw 

 at side, p, arm for carrying condenser ; it rotates. Not 

 drawn to scale, but drawn too long. R, condenser (not 

 drawnto scale), s, screw arrangement for fixing condenser. 

 T, horizontal section of pinching collar, v, another form of 

 collar which could be substituted for the pinching collar. It 

 has a screw acting on a brake, which, being a segment of a 

 circle, does not damage the pillar, w, horizontal section of 

 same, showing brake worked by screw. Scale 1 = 2 (about). 



flame (which is at the outer circumference of the oil 

 container) being brought close to the stage of the 

 microscope. (2) The screw motion sliding gear 

 fixed on top of the base, admits of a lateral move- 

 ment of half an inch on each side of the centre of the 

 base, thus facilitating exact centering of the light. 

 (3) The oil container, having the pillar passing 

 through its centre, causes the lamp to be more evenly 

 balanced all round ; if necessary, the oil container 

 could be slightly weighted on the side opposite to the 

 burner. (4) The container being shallow, and the 



Fig. f5. 



Fig. 66. — Vertical section at middle of sliding gear for fitting 

 over the base ; showing the pillar. Not drawn to scale. 



Fig. 67. — Sliding gear showing screw stem, which can be made 

 long enough to project just outside the feet of the base to 

 facilitate turning the screw. Not drawn to scale. 



foot also being shallow, the light can be brought 

 close to the table, or it can be raised above the stage 

 for use, with a condenser above the stage. (5.) The 

 pinching collar provides a very efficient and facile 

 control over the vertical movements of the lamp. 

 The letters on the sketch with the accompanying 

 description give a full explanation of the lamp. — 

 J. A. Ross, M.D., Folkestone. 



Tylar's Micro-Photographic Camera. — Mr. 

 \V. Tylar, 57 High Street, Aston, Birmingham, has 

 kindly forwarded to us an ordinary specimen of the 

 above apparatus. It is neatly packed into a well 

 arranged case, and is accompanied with all the 

 accessories necessary for micro-photography. The 

 price, even in these days, is marvellously cheap, and 

 it can only be due to the number demanded of Mr. 

 Tylar that the instrument can be turned out at the 

 price. With it, anybody who is even only slightly 



