m 



BEXJ. TIKE S, JR., DESCRIPTIVE CATALOGUE. 



out, and cov 



Fig - 67a Slide Head Linen 



Prover. (Fig. 673.) 

 This arrangement 

 has a slide covering 

 the glass, which is 

 opened by a small pin 

 at the top, the lower 

 part of the frame be- 

 ing a tube with por- 

 tions of the sides cut 

 by a brass cap when not in use. 



Price, $1.00. 



r\ K . en. Fold-ing Linen Prover. (Fig. 674.) 



The folding linen prover is formed 

 of a brass or German silver frame, the 

 best having a steel spring at the back ; 

 the top and bottom jointed to allow 

 them to be turned close down on each 

 other, and when closed occupy but a 

 space of a quarter of an inch in thick- 

 ness, half an inch in breadth, and one 

 in length, and is very convenient for the pocket. 



Price, plain brass mounted, $0.75. 



. " best " " $1.25. 



" German silver " $1.50 



Opera Glass. The opera glass is 

 a Galilean telescope, with a large 

 object glass, and usually more ex- 

 pensively mounted than the ordinary 

 instrument. The best have achromatic 

 object glasses ; they are mostly used 

 of late arranged for both eyes, having 

 between the tubes for containing the 

 glasses, an adjusting screw, with a 

 roller milled on the edge, by the turn- 

 ing of which, the glasses may be 

 easily moved to the distance required 

 for perfect vision. They are mounted in metal bodies, 

 which are japanned black, or in gilt, ivory, pearl, or tortoise- 



