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Locks for window screens?

I rent a duplex that has newer double hung windows. I love to keep my windows open at night but I am concerned that they are not very secure! When I was cleaning my windows outside yesterday I noticed that all I have to do is push up on the screen and it slides right up! So if the window is unlocked or open, you have easy access right into my house! I know I should keep my windows closed and locked, but there has to be a way to secure my screens! Do they make a lock or some device to install to prevent them from sliding upwards? Thanks!


Under pressures greater than 5.11 atmospheres CO2 can exist as a liquid. What is happening inside the extinguisher is that the gas is pressurised, so when the temperature gets cold enough some of it condenses, forming a pool of liquid CO2 in the cylinder. The phase diagram of CO2 will help to explain what I mean: /chemix/english/ph You can see from this that at even lower temperatures, -55 or less, the liquid CO2 would freeze, forming dry ice. It also shows that at atmospheric pressure liquid CO2 cannot exist.
It's hard to say without the weights and thicknesses listed- for an ABS bumper, I'm assuming that it's close enough to a fixed point where there isn't too much give in the actual bumper plastic- there's another flexible epoxy called Gluvit that I've used to make repairs in wooden boats in areas with a lot of give- if you lay up the fiberglass properly, it can be done, and last a long time.Flexible epoxy will give over time if it's unsupported- if, for example, it's used to hold a weight at the end of an outthrust, like a foglight that's got a small bracket. In that case, it's better to immobilize the attachment point, in my opinion, to minimize the amount of 'give' around the base of the bracket.For myself, I would use polyester resin, not epoxy- it has the ability to flex more before stress cracks sap the strength of the bond. With ABS plastic, the smartest thing you can do is to put a backing plate on the base of the foglight and throughbolt the whole thing. The epoxy or polyester resin is not strong in itself- it has impact resistance, but that's it- the strength comes from the fiberglass that you lay up into the resin. That's why JB weld is only good for filing holes- it has no strength to resist flexing. Before you put on the backing plate, however, lay up a strip of fiberglass matting somewhere to thicken up the 'meat' that you'll be drilling into to mount your bracketpreferably on the underside of the bumper. Then lay up a strip of biaxial fabric, then more matting over that. You'll have to read up on how to do this. Cut and fit the fabric beforehand to make sure you've got the right size material ready to use. Make sure not to lay the fabric along the edge where the backing plate will lie- it'll just peel off- you want overlap to minimize flex in the plastic.Let the whole patch cure for 12-24 hours, Drill and place your bracket and backing plate, and you're done.

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